By now, it was no secret to the world what Israeli-based Nostra was up to. Heck, their latest endeavor was aimed to kill the power to the entire world. However, with a new president at the head of the company/militant group, they were able to swipe a prototype teleporter from the one group who constantly landed blows against them: the International Espionage Service. Soon after, they decide to test the device, to see if it even works.
Long story short, they managed to get into Equestria, and even moved a large portion of their forces into the alternate dimension, under false pretenses of a "peaceful mission".